Abstract
Among utilization methods of the renewable energies, an offshore wind power is one of them expected to be in a practical use. A project to construct offshore wind power facilities is on-going off Kita-Kusyu City. Unlike the onshore construction, there are many problems to be solved in the offshore construction. In this study, examinations was made on the construction control required throughout the project period, especially by focusing on how to achieve the verticality in offshore installation to meet the requirements given by the wind turbine supplier and what sort of controls are required in order to achieve the safe offshore execution within a limited construction period.